{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{3}{c}}
\hline\hline
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}\\
            &\multicolumn{1}{c}{No knowledge}&\multicolumn{1}{c}{Moderate Knowledge}&\multicolumn{1}{c}{High Knowledge}\\
\hline
assignment  &     -0.0661** &      0.0754   &    -0.00933   \\
            &    (0.0328)   &    (0.0471)   &    (0.0426)   \\
\hline
\(N\)       &         390   &         390   &         390   \\
Mean        &        0.22   &        0.53   &        0.25   \\
\hline\hline
\multicolumn{4}{l}{\footnotesize Standard errors in parentheses}\\
\multicolumn{4}{l}{\footnotesize * p<0.10, ** p<0.05, *** p<0.01}\\
\end{tabular}
}
